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	<title>行与块</title>
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		p{
			height: 30px;
			text-align: right;
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		span{
			height: 40px;
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		a{
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	<a href="">独立占一行</a>
	块：独立占一行，有宽度属性
	行：不会独立占一行，没有宽度属性
	行-块
	<p>这个是一个P</p>
	<p>这个是一个P</p>
	<span>这是一个span</span>
	<span>这是一个span</span>
	<span>这是一个span</span>
	<span>这是一个span</span>
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